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Obviously I don't know your wife's personality, but one possibility would be for her to go ahead and take the classroom part, and if she still feels uncomfortable, she can bail out before going into the water. Also, reminding her that you'll be right there to help if anything goes wrong, might...

Probably a 6-day deco, right?

Not a lot of details, but nonetheless interesting: Navy Experimental Dive Unit Team Begins 11-Day Saturation Dive

I see 1 to 2 fairly routinely (though not always) on my LDS fills. Just for grins, I tested the open air on the boat I was on when the fumes got bad, and got about 10 ppm.

If you have a history of ear and sinus trouble, SCUBA may not be your best choice of hobbies. I have always been a bit slower equalizing than most of my buddies even though I have no history, but can still get down if I take my time. I understand that there are some surgical options that may...

Yup, that's something my instructor emphasized when he gave my "intro to New England diving" a couple of years ago. Getting your mask off and your face in the water is important at the start. I have found that even when diving wet, dry gloves help a LOT. I got a pair of those insulated...

And you can cut steel by heating it to red hot, and then spraying pure oxygen on it along the line you want to cut.

Yup. There's nothing magical or particularly complex about inertial navigation, it's just challenging engineering to do it in a relatively small package at a price that divers will pay. If you stay at the surface for 30 sec or so for the gps to pick up your drift, before shifting to inertial...

Actually, I had never heard of it before this thread; I was just going by the description posted a few posts above, which made me think of the Throat, which I HAVE done.

I haven't done Mary's place, but that description of an entrance ~70-80', cave/cavern/swim through, easy to take wrong turns, and exiting on the blue side sound pretty familiar.

That place sounds like it has a lot in common with The Devil's Throat in Cozumel.

I like my 7mm because it's simple compared to maintaining and diving a dry suit, and is good down into the low 50s water temp for long dives, and low 40s for up to 30 - 40 min.. I'm not going to go the semi-dry route for longer cold-water dives, though; the next step will be full dry.

And what is your resting heart rate? I'll bet 75 is significantly above your resting level.

A slouch will, though the difference may not be large. And unless you NEVER fin yourself anywhere under the water, you always have some exertion.

I'm kind of in that "in between" state: experienced enough that they don't feel the need to put me with a more-experienced diver or the DM for safety, but not experienced enough that they want to have me go watch over a less-experienced diver either.

Wow, you could TEACH Nitrox for them, but they wouldn't accept those cards???

Personally, I'd go with the 7mm, with no hood, booties or gloves. It would likely be a bit warm, especially if you're working hard (fighting current, etc), but if you're on long dives and not doing much (drifting, taking pix, etc), it would likely work.

Yes, according to the picture of her ID that someone posted, she was born in 1944.

If the medical issue was triggered by stress from an equipment failure, probably not all that far-fetched. But again, a diver with 700 dives could probably handle most of the common failure modes. However, I'll bet that a stream of exhalation bubbles looks pretty continuous if you're far...

The reason it should help is that your body is better at doing higher levels of work without as much increase in breathing rate. I certainly notice that when I'm in shape, I don't breathe as hard when I'm hiking up a hill or climbing up stairs, as I do when I'm out of shape. I can also cruise...